Winding machines

ABSTRACT

Apparatus for use with machines for winding webs of material on cores to separate the traveling web and reapply it to a new core, which apparatus utilizes a separating element pivotable in concentric relationship with the core and having a compressed air chamber and orifices for directing air toward the core to hold the web thereon when the web is being applied to a new core.

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States atet 11 1 1111 3,908,924

Schulze 1 Sept. 30, 1975 [54] WINDING MACHINES 3,642,221 2/1972 Hellemans 242/56 R 3.756.526 9 1973 B tt t l 242 56 R [75] Inventor: Wilhelm Schulze, Gruenenplan, me e d l ermany Primary E.\'mniner.lohn W. Huckert Assigneer Maschinenbau Greene GmbH & Assistant Examiner lohn M. Jillions Kreiensen, Germany Attorney, Agent, or Firm.-Edmond T. Patnaude 22 Filed: May 16, 1973 [21] App]. No.: 360,787 ABSTRACT Apparatus for use with machines for winding Webs of material on cores to separate the traveling web and [52] US. Cl. 242/56 R; 242/56 A h [51] Int. Cl B65h 19/28 reapply. to a new i W apparatu s un 128.5 a Field of Search 242/56 R 56 A 65 56 6 separatmg element pwotable 1n concentrlc relat1onship with the core and having a compressed air cham- References Cited her and orifices for directing air toward the core to hold the web thereon when the web is being applied to UNITED STATES PATENTS a new Core 3.202.374 8/1965 Phelps 242/65 3,482,793 12/1969 Mainstone 242/56 R 7 Claims, 7 Drawmg Figures US. Patent Sept. 30,1975 shw 1 of7 3,908,924

US. Patent Sept. 30,1975 SheetZ 0f7 3,998,924

US. Patent Sept. 30,1975 Sheet 3 of7 3,908,924

US. Patfint Sept. 30,1975 Sheet4 0f7 3,908,924

US. Patent Sept. 30,1975 Sheet 5 of7 3,908,924

US. Patent Sept. 30,1975 Sheet6of7 3,908,924

US. Patent Sept. 30,1975 Sheet 7 of7 3,908,924

WINDING MACHINES i The invention relates to a device on winding machines for webs of material, in particular plastic films, for separating the traveling web and reapplying it to a new winding sleeve or core, which is rotationally driven by a winding shaft or mandrel, with a separating element movable into the path of movement of the web of material and extending over the width of the web.

in the manufacture of webs of material of the most varied kinds, particularly in the manufacture of plastic films, which can 'also' be tubular; there is a'particular problem in separating the web of material which is being wound on a core to form a log roll and applying the leading end of the web being fed through a new winding core. Devices of the kind mentioned initially are known, in which the separating element is moved transversely into the web of material with a translatory movement or with a pivoting movement about a pivot axis lying outside the axis of the winding core, in order to carry out the separating procedure. This separating procedure also has considerable difficulties. It is particularly difficult with plastic webs, because of their flexibility, to carry out a clean and complete separating process with a separating element which is moved in this way, and with the high winding speed which is required in modern industry. Application of the leading end of the moving web of material to a new winding core also leads to further difficulties with the known devices. These difficulties arise more particularly with plastic webs, since the beginning of the new winding should be applied without any wrap or cover and without folds. The aids used for this purpose on the known devices, for example brush devicesfare not sufficient, in connection with the separating procedure envisaged here, to allow clean application at high winding speeds.

The invention is based on the problem of providing a device of the above-mentioned kind, by means of which both the separating process and the applying process can be carried out cleanly and safely at high winding speeds, in particular when winding plastic webs, the device furthermore having a construction which is as reliable and safe as possible in operation and is simple to control at high winding speeds. This is achieved in accordance with the invention in .that the separating element with its working edge is pivotable coaxially with the winding core in the feed direction of the web material about the winding'core into the separating and applying position. in this way, the pivot axis of the separating element and the rotational axis of the core or'of its mandrel coincide. However, this; means that when guiding the still unseparated web about the core and when initiating. the separating process by pivoting the separating element, this separating element carries out the separating process in a direction tangential to the winding core, and thus the beginning of the on-running web moves in the direction of the circumference of the winding core, so that this leading end can easily be engaged by the pressure means provided and can be applied substantially free from folds. it has been shown that as a result of the coaxial rotational 'movement of the winding core with the web of material on the one hand and of the separating element on the other hand, the separating procedure can also be carried out in a satisfactory manner at high winding speeds, even while separating plastic webs and when using separating elements, for plastic webs, which are frequently and preferably saw-toothed. Furthermore, it

has been shown that the application process can be carried out safely and without folds even without additional mechanical means, as were necessary in the form of brush arrangements in the known devices. The device described can be used both with so-called center winders and with so-called surface or contact winders in the same manner, as will be described below.

According to one embodiment of the invention, the web is guided before separation and application by a press roll arranged before the pivot region of the separating element and by a guide roll spaced from the core, and the web is wound around part of the circumference of the core and leaves the latter in the pivot region of the separating element. in this way, a particularly advantageous association of the web, the core and the separating element is achieved, and furthermore, the application procedure is essentially improved, since during separation, which takes place at a high speed, the end of the web is introduced quickly and safely into the gap between the press roll guiding the web and the core, so that the application step is completed quickly and safely. With the aid of the guide roll it is possible to locate the section of the web passing between the core and the guide roll in relation to the separating element in the best position for the separating step.

According to a further preferred embodiment of the invention, application of the beginning of the web onto the core can be improved particularly effectively and can be secured without folds, by providing the separating element at the front edge in the pivot direction, with an air chamber which is substantially concentric to the winding core on its surface next to the core, which is provided with compressed air outlet openings directed towards the web, and which is pivotable with the separating element. This ensures that during and after the separating process, compressed air is constantly directed at the end of the traveling web, so that this end is applied to the winding core safely and free from folds. Particularly when separating plastic webs, the fold-free applying process is considerably enhanced and notably high winding speeds can be selected.

A construction for the device which is particularly suitable for carrying out the mode of operation described is achieved in a further development of the invention in which the separating element or the air chamber with the separating element is positioned on either side of the winding core by means of co-pivoting bearing elements, each in an annular groove, which is provided in a bearing member centrally supporting the drive mandrel of the winding core. Thus in a further development of the invention, this bearing member can be divided to receive the winding core with its drive mandrel in the form of a tilting bearing, or the bearing member can be provided with a radially-directed aperture for receiving the winding core with its drive mandrel. Depending upon the manner of guiding the empty winding core with the drive mandrel, safe reception in the device can be assured. Thus by suitable control and drive means, reception of the winding core with the drive mandrel and the pivotal movement of the separating element or of the air chamber with the separating element can be carried out safely and automatically during the course of operation of the entire winding machine.

Drive of the separating element or of the air chamber with the separating element, which is particularly simple and automatically safe to control, is achieved according to a further feature of the invention, in that, for the pivotal drive of the separating element or of the air chamber with the separating element, a toothed segment which is connected to the separating element or to the air chamber is arranged on at least one side of the winding core and is in engagement with a longitudinally drivable gear rack. The gear rack can be driven for example by pneumatic or hydraulic means in synchronism with the winder so that the tilting bearing of the bearing member is also driven safely by hydraulic means in synchronism with the winder.

As has already been mentioned above, the device according to the invention can be used both with differential, i.e., center winders and with contact or center and surface winder.

In accordance with a particularly advantageous embodiment of the device according to the invention for use on a center winder machine equipped with a winding turret, the separating element or the air chamber with the separating element and the associated bearing and drive members as well as the associated press and guide rolls are arranged on at least one pivot arm which is pivotable into the separating and applying position of the winding turret. In this way, the separating device is kept outside of the winding region during operation of the winding machine, while when in the known way the turret rotates into the separating and applying position with the new core and its drive mandrel, the device can be changed to the operating position by means of the pivot arm in a simple manner, whereupon in the simple and safe manner described, separation and application of the beginning of the web onto the new winding core takes place.

In another preferred embodiment of the invention which is particularly suitable for use on a surface winding machine in which the web of material is led from a guide cylinder to a contact cylinder and from this to a driven winding core removably mounted on a holding device, the separating element or the air chamber with the separating element and the associated bearing and drive members, as well as associated feed and guide rolls, are arranged in the region between the section of the web moving from the guide cylinder to the contact cylinder on the one hand and the section of the web moving from the contact cylinder to the rewind core on the other hand and, furthermore, a pivot arm is positioned about the axis of the contact cylinder and on either side of the contact cylinder, the free end of which arm is movable into the delivery region of a magazine delivering empty winding cores with mandrels and which is arranged to receive and drive winding cores with mandrels, the pivot arms being pivotable, after receipt of the winding core with the drive mandrel, out of the magazine, against the direction of rotation of the contact cylinder and, while taking the web of material moving between the guide cylinder and the contact cylinder in the form of a loop, into the separating and applying position which is determined by the separating of the separating and applying device can be safely controlled, for example, by hydraulic means operating in synchronism with the working rhythm of the winding machine.

particularly when operating with comparatively thin plastic webs, it has been found preferable to provide additional support for the process of application of the beginning of the advancing web of material. This is achieved according to a further preferred embodiment of the invention in that a smoothing device, e.g., an elongated brush, is arranged before the working edge of the separating element, in the direction of movement of the web, and this brush extends over the width of the web, the separating element with the smoothing device being positioned so as to be pivotable on the air chamber such that the smoothing device is held out of contact with the web of material when the separating element and air chamber are in the rest position and upon initiation of the separating movement, is pivoted with the separating element for application against the web of material and for support on the air chamber. In this way, while maintaining the described separating procedure, smooth application of the beginning of the web of material being fed through is achieved since the brush or other smoothing device rotates simultaneously with the separating element and so in particular removes an air cushion which forms before the beginning of the web of material. It thus becomes possible, by means of the pivotable positioning, to keep the brush or other smoothing device out of contact with the web of material in the rest position so that any mechanical influence of the web of material and in particular of thin plastic webs outside the separating process is avoided.

In the accompanying drawings, preferred embodiments of the invention are illustrated. Those parts of the device and of the winding machine which are essential for explanation and clarification of the invention are shown in a predominantly diagrammatic way. In the drawings:

FIG. 1 shows a sectional view of the parts of the device which are essential for explaining the separating and applying components of the device, in the position for reception of a new winding core with its drive mandrel before the separating and applying process;

FIG. 2 shows a sectional view similar to FIG. 1 in the operative position after carrying out the separation and application by means of the separating element with the air chamber;

FIG. 3 shows a longitudinal section through the device of FIGS. 1 and 2, only those parts which are essential for explanation being shown;

FIG. 4 is a side view, which is diagrammatic as far as possible, showing a difierential winding machine with the device according to the invention, only the essential components of which are illustrated, also;

FIG. 5 is a representation, which is also diagrammatic as far as possible, showing a contact winding machine with the device according to the invention, in which again only those parts of the machine whieh are essential for explanation of the invention are shown in a diagrammatic manner.

FIG. 6 shows a diagrammatic view corresponding in principle to the illustration in FIG. 1 of a further embodiment of the device according to the invention in the rest position;

FIG. 7 shows a view corresponding to FIG. 6 after completion of the separating process, that is with the air chamber and separating element pivoted into position.

Referring to the drawings, the construction and oper ation of the main components of the device according to the invention are explained below in conjunction with FIGS. 1 to 3 of the drawings.

In FIGS. 1 to 3, the parts of the device are shown either on one side of the winding machine or on an end of the winding core with the drive mandrel. These components are to be regarded as being provided symmetrically on both sides of the machine, insofar as nothing is mentioned to the contrary.

The web of material 1, e.g., a plastic film or tape, which can also be made in tubular form, is first guided into the separating and applying position of the winding machine in the way illustrated in FIG. 1, so as to wrap around part of the periphery of the empty winding sleeve or core 2 with its drive shaft or mandrel 3. The device also includes a pull or feed roll 4, which is urged by spring pressure against the core 2, and a pull or guide roll 5 which is arranged at a distance from the core 2. In the operational condition illustrated in FIG. 1, the web 1, after leaving the guide roll 5, is guided to the take-up or rewind core which is in use in this state of operation.

Furthermore, the device includes a separating element 6 extending across the width of the web of material, which can be formed as a knife, saw or even a welding rod or wire, depending upon the material to be separated. The separating element 6 is arranged at what is, in relation to the direction of movement of the web of material and to the direction of pivotal movement of the separating element (still to be described) the front edge of an air chamber 8, the surface of which extends substantially concentrically to the winding core at the side which is adjacent the core 2 and is provided with compressed air outlet openings 7 directed towards the web and in its feed direction; this chamber 8 is supplied with compressed air in a suitable manner, in use.

The separating element 6 with the air chamber 8 and its knife or other working edge is pivotable as a unit about (and coaxially to the core) 2, which is shown in the separating and applying position in FIGS. 1 and 2, together with its drive mandrel 3, in the feed direction of the web 1. The air chamber 8 and the separating element 6 are each mounted in an annular groove by means of co-pivoting bearing rollers 9 on either side of the core 2, which groove 10 is provided in a disc-like bearing plate 11, which also carries bearing rollers 12, which serve to provide central mounting of the drive mandrel 3 carrying the core 2. The mandrel 3 and thus the core 2 are driven rotatably in a suitable manner. As can be seen in particular from FIGS. 1 and 2, the bearing plate 11 is divided in the form of a tilting bearing having a hinged joint 13, so that it can receive the newly-supplied core 2 with its mandrel 3 before the separating and applying process. It is also possible, however, for the bearing plate 11 to be provided with a suitable radially-directed aperture for receipt of the core 2 with its mandrel 3.

For pivotal driving movement of the separating element 6 with the air chamber 8, a toothed segment 14 connected to the separating element 6 and the air chamber 8 is arranged on at least one side of the coremandrel unit 2, 3, or of the machine, which segment 14 is in engagement with a longitudinally driven toothed rack 15 in the manner illustrated in FIGS. 1 and 2.

The method of operation of the parts of the device described is as follows: FIG. 1 shows the operating position in which the core 2 with its mandrel 3 has been brought into the separating and applying position. The bearing plate 11 was opened at the hinge bearings 13 for this purpose. The web 1 moves from the feed roll 4 to the guide roll 5 in the manner shown in FIG. 1, partially wrapping around the winding core 2, and from the roll 5 to the rewind coil which is in use at that time. The spring-loaded feed roll 4, which is rubber-covered for example, presses the web 1 against the rotating winding core. Since the core is driven in a known way by a torque-controlled winding motor (not shown), the core 2 is completely synchronized with the feed rate by the web of material which presses against it. In the embodiment illustrated in FIGS. 1 and 2, the two tilting bearings 13 for the bearing plates 1 1 are closed on both sides of the core, so that the annular groove 10 is closed. The separating and applying process now be gins. By means of drive from, for example, a pneumatic or hydraulic cylinder, the separating element 6 with the air chamber 8 is pivoted about the winding core 2 by the toothed rack 15 and the toothed segment 14 in the feed direction of the web 1, coaxially with the winding core, by about half a revolution about the pivot axis. At the same time, compressed airis introduced into the air chamber 8. By means of the very quick rotary movement of the separating element 6, the web 1 is separated at its section running between the core 2 and the guide roll 5, and the resultant new leading end 1a of the moving web pressed against the core 2 in a fold-free condition by the pivoting movement of the separating element 6; this is effected essentially by the compressed air coming from the outlet openings 7 of the air chamber 8, as shown in FIGS. 2. The web is thus held on the rotating core 2 by the feed roll 4 and the beginning 1a of the web moves without folds into the gap between the feed roll 4 and the core 2. Since the drive of the core 2 via the drive mandrel 3 is effected in known manner by means of a torque-dependent winding motor, the tensile force previously applied remains fully effective, so that the web 1a, 1 is tightly wound on the new core 2 and thus cannot slip. By returning the toothed rack 15 and the toothed segment 14, the air chamber 8 and the separating element 6 are guided back to the initial position and the new core 2 can be used for further winding, depending upon the type of winding machine being used.

FIG. 4 shows diagrammatically an embodiment of the 7 device according to the invention on a so-called center winding or differential machine. With this machine, in known way, a so-called turret winder 16 is used, which in the form shown is a two-armed lever which supports, on one arm, the drive roll 17 being wound and, on its other arm, the new core to be wound, with its drive mandrel 3. The log roll 17 and the core 2 are driven in known manner in a torque-dependent fashion.

The device according to the invention is constructed, for use with such a winding machine, by arranging the separating element 6 with its air chamber 8, as well as the associated bearing and drive elements shown and also the associated pull or feed roll 4 and pull or guide roll 5, on at least one pivot arm 18 which is pivotable into the separating and applying position of the turret 16 illustrated in FIG. 4. A pneumatic or hydraulic cylinder 19, which acts at a distance from the pivot bearing 20 of the arm 18, serves to move the pivot arm 18.

The method of operation of such a device is as follows: If an exchange of cores is to be made, then the turret 16 of the machine is turned so that the moving web passes around the empty core 2 to the full roll 17, so that the empty core 2 reaches the separating and applying position shown. The associated tape drive motor is in operation. The pivot arm 18 is now moved by means of the drive cylinder 19, in the method illustrated in FIGS. 1 to 3 with the bearings 13 of the bearing plate 11 open, into the separating and applying position for the core 2, until the drive mandrel 3 of the new core 2 is received centrally on the bearing rollers 12 in the way illustrated in FIGS. 1 to 3. The hinges 13 of the bearing plates 11 are then closed and the separating and applying process illustrated in FIGS. 1 to 3 takes place, whereupon the pivot arm 18 is returned to the position shown, while the bearing hinges are opened, and the core 2 being wound remains on the turret 16, while the full roll 17 is removed in a suitable manner.

In FIG. 4, a pneumatic cylinder 21 is illustrated diagrammatically, as an example, which serves to cause pivoting of the separating element 6 with the air chamber 8 and, in particular, for actuating the toothed rack of FIGS. 1 to 3.

In FIG. 5, a further embodiment of the invention is illustrated, for use on a so-called contact winding machine. In the drawing, only those parts of the contact winding machine are shown diagrammatically which appear necessary to explain the invention. In such a contact winding machine, in known manner, the web 1 is led from a supply arrangement or machine, which is not shown, and is directed round a guide cylinder 22 to a contact cylinder 23 and from this to a driven winding core 25, which is removably located on a supporting device 24.

The separating and applying device described in conjunction with FIGS. 1 to 3, is mounted in the contact winding machine in the region between the web section moving from the guide cylinder 22 to the contact cylinder 23 on the one hand and the web section moving from the contact cylinder 23 to the rewind core 25. The contact cylinder 23 thus takes over the role of the guide roll 5 of the device described in FIGS. 1 to 3. This separating and applying system is rigidly installed, for example in the two side frames of the machine. Two pivot arms 27 are rotatably positioned on the two shaft journals 26 of the contact cylinder 23 and are driven independently of the drive of the contact cylinder by a brake motor 28. At their free ends, the pivot arms 27 receive a new winding core 2 with its drive mandrel 3 from a magazine 19 containing empty winding cores 2 and mandrels 3. A torque-dependent winding motor 30 drives the mandrel 3 which is then positioned on the pivot arms 27 by means of suitable transmission and drive connections. By suitable means, which are shown diagrammatically in this case at 31, the mandrels 3 are held safely in the mounting notches or opening 32 of the pivot arms 27.

On initiation of the separating and applying process, the pivot arms 27 move against the direction of rotation of the contact cylinder 23 into the separating and applying position of the device which is illustrated in continuous lines, so that the loop marked 1b in FIG. 5 is formed in the moving web of material 1. As regards the following separating and applying process, reference is made to the illustration and description of FIGS. 1 to 3. The pneumatic cylinder 21 also serves to cause the pivoting movement. As soon as the mandrel 3 of the newly inserted core 2 touches the bearing rollers 12 of the device, the brake motor 28 is switched off. In the manner described, the separating and applying process is then initiated and completed, whereby the free end of the moving web of material 1 is placed against the new core 2 in the way described and is wound on to it. If this winding process is completed, then the newlyformed web of material is pivoted about the contact cylinder 23 with the aid of the pivot arms 27 by a pivotal movement in the feed direction of the web 1 or in the direction of rotation of the contact cylinder 23, whereby the new core 2 driven by the winding motor 30 further winds up the moving web of material 1. During the period of pivoting of the pivot arms 27 in the feed direction of the web or in the direction of the web or in the direction of rotation of the Contact cylinder 23, the full winding core 25, i.e., the wound roll located in the rewind device 24, which is also driven by a torque-dependent winding motor 33, has wound up the separated end of the moving web of material and is brought, e.g. pneumatically, into a position suitable for removal, namely by horizontal displacement or the rewind device 24. The device 24 is then restored by suitable means to the initial position, e.g., by a cable cylinder 34. The newly-wound roll core 2 in the pivot arms 27 is then transferred to the rewind device 24. Finally, the core 2 so transferred and wound is pressed, e.g., pneumatically, against the contact cylinder 23, whereby the winding motor 33 remains fully effective for the winding core 2 then being wound. The desired hardness of the roll can be adjusted by the pneumatic pressure system in a suitable manner. The drive motor 35 provides rotary drive of the contact cylinder 23 independently of the pivotal drive of the pivot arms 27.

In FIGS. 6 and 7, a further embodiment of the invention is illustrated diagrammatically and those parts are reproduced which are necessary to explain this embodiment. FIGS. 6 and 7 again show the winding core 2, the feed roll 4 and the guide roll 5 with the web of material.

In this embodiment, the separating element 6' is secured to a two-armed pivotable lever 36, which is pivotally mounted at 37 on the forward wall of the air chamber 8' in relation to the direction of movement of the web of material 1. A smoothing device in the form of an elongated brush 38 is arranged on the separating element 6' before the working edge of the separating element 6' and is directed towards the core 2 over the entire width of the web. The second arm 36a of the lever 36 is bent at an angle and supports a roller 39. Furthermore, the arm 36a of the lever 36 is biased by a spring 40 in the pivotal direction towards the air chamber 8' and the core 2.

FIG. 6 shows the rest position of the device. In this rest position, the arm 36a is held in position against the action of the spring 40 by means of the roller 39 and a suitable lift cam 41 or other device, so that the long brush or other smoothing device 38 is held in this rest position out of contact with the web of material 1.

Upon initiation of the separating movement, that is the pivotal movement of the air chamber 8' in the manner described above, the pivoting arm 36a is released, so that the separating element 6' and the brush or other smoothing device 38 move towards the web of material 1 and the brush 38 presses the leading end of the web of material 1 with a smoothing or wiping action against the winding core 2 after the separation step, which position is shown in FIG. 7. In this way, safe application of the beginning of the web of material 1 is effected, without mechanical action on the web of material 1 and thus on a thin plastic film taking place by means of the brush or other device 38 in the rest position. In the free or operative position, the pivot arm 36 rests against the front wall of the air chamber 8', as shown in FIG. 7.

While the present invention has been described in connection with particular embodiments thereof, it will be understood that those skilled in the art may make many changes and modifications without departing from the true spirit and scope thereof. Accordingly, the appended claims are intended to cover all such changes and modifications as fall within the true spirit and scope of the present invention.

What is claimed is:

1. Apparatus for transferring a moving web from a rotatably driven winding roll to a rotatably driven empty core over which said web travels, the combination comprising a feed roll biased toward said core,

said web passing between said feed roll and said core,

a separating element having a web cutting edge extending traversely across said web between said winding roll and said core and further having an air chamber with air outlets for directing compressed air against said web toward and across the width of said core,

means mounting said separating element for coaxial rotation with said core,

drive means for rotating said separating element coaxially of and in the direction of rotation of said core to sever said web intermediate said winding roll and said core and to force the severed end of said web against said core in proximity to said feed roll by means of compressed air blowing the severed end portion of said web against said core,

said air chamber having a concave wall partially surrounding said core through an angular distance of at least ninety degrees and defining a confined space between said wall and said core into which said air outlets open whereby said concave wall rotates around said core with said separating element to permit the air pressure built up in said confined space to hold the severed end of said web against said core,

whereby said web is transferred to said empty core without the formation of wrinkles therein.

2. Apparatus according to claim 1 wherein said wall is a surface concentric with and spaced from the outer surface of said core.

3. Apparatus according to claim 1 further comprising a smoothing device mounted to said separating element between said cutting edge and said air outlets and extending across the width of said web,

said smoothing device contacting said web only when said separating element is rotated into a web cutting and transferring position.

4. Apparatus according to claim 1 comprising a pair of pivotably connected plate members having a centrallly disposed opening for rotatably supporting said core.

5. Apparatus according to claim 1 comprising a tooth segment connected to said separating element, and

a longitudinally movable toothed rack in driving engagement with said segment for effecting pivotable movement of said separating element.

6. Apparatus according to claim 1 in combination with a differential winding machine having a turret, including an arm pivotable into the separating and applying position of said turret, and means mounting said separating element and said feed roll on said arm.

7. Apparatus according to claim 3 wherein said smoothing device comprises an elongated brush.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PatentN 3,908,924 Dated September 30. 1975 In WILHELM SCHULZE It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 9, line 28, "traversely" should be "transversely-- Signed and Scaled this ninth Day of March 1976 [SEAL] A ttes t:

RUTH- C. MRSON C. MARSHALL DANN AHPJIIIIX ff ('mnmissimwr nflatems and Trademarks 

1. Apparatus for transferring a moving web from a rotatably driven winding roll to a rotatably driven empty core over which said web travels, the combination comprising a feed roll biased toward said core, said web passing between said feed roll and said core, a separating element having a web cutting edge extending traversely across said web between said winding roll and said core and further having an air chamber with air outlets for directing compressed air against said web toward and across the width of said core, means mounting said separating element for coaxial rotation with said core, drive means for rotating said separating element coaxially of and in the direction of rotation of said core to sever said web intermediate said winding roll and said core and to force the severed end of said web against said core in proximity to said feed roll by means of compressed air blowing the severed end portion of said web against said core, said air chamber having a concave wall partially surrounding said core through an angular distance of at least ninety degrees and defining a confined space between said wall and said core into which said air outlets open whereby said concave wall rotates around said core with said separating element to permit the air pressure built up in said confined space to hold the severed end of said web against said core, whereby said web is transferred to said empty core without the formation of wrinkles therein.
 2. Apparatus according to claim 1 wherein said wall is a surface concentric with and spaced from the outer surface of said core.
 3. Apparatus according to claim 1 further comprising a smoothing device mounted to said separating element between said cutting edge and said air outlets and extending across the width of said web, said smoothing deviCe contacting said web only when said separating element is rotated into a web cutting and transferring position.
 4. Apparatus according to claim 1 comprising a pair of pivotably connected plate members having a centrallly disposed opening for rotatably supporting said core.
 5. Apparatus according to claim 1 comprising a tooth segment connected to said separating element, and a longitudinally movable toothed rack in driving engagement with said segment for effecting pivotable movement of said separating element.
 6. Apparatus according to claim 1 in combination with a differential winding machine having a turret, including an arm pivotable into the separating and applying position of said turret, and means mounting said separating element and said feed roll on said arm.
 7. Apparatus according to claim 3 wherein said smoothing device comprises an elongated brush. 